How to validate email addresses in C# .NET

Our free API to validate e-mail addresses is really easy to use in C# .NET


Validate e-mail in C# with RestSharp

var client = new RestClient("");
var request = new RestRequest(Method.GET);
request.AddHeader("x-rapidapi-host", "");
request.AddHeader("x-rapidapi-key", "YOUR-API-KEY");
IRestResponse response = client.Execute(request);


This will return a JSON-array with information about the domain, and if you should block it or not.


Validate e-mail in C# with Unirest

Task<HttpResponse<MyClass>> response = Unirest.get("")
.header("X-RapidAPI-Host", "")
.header("X-RapidAPI-Key", "YOUR-API-KEY")


You can of course just send it as a regular GET-request to that URL also, in your favorite way, as long as you have the API-key in the header.

You will receive a JSON response, telling you if this is a disposable e-mail to block, or if there are other issues with the domain:


    "valid": true,
    "block": true,
    "disposable": true,
    "domain": "",
    "text": "Disposable e-mail",
    "reason": "Heuristics (2a)",
    "risk": 91,
    "mx_host": "",
    "mx_info": "Using MX pointer from DNS with priority: 0",
    "mx_ip": "",
    "last_changed_at": "2020-06-11T09:56:02+02:00"


This will tell you if you should block the domain or not, and the reason to why the API thinks so (disposable e-mail, etc). You can also see more detailed documentation of the response here.

To get started for free, and get an API key, click here!